New Nanoparticles Make Trace Chemicals Easier to Detect

On 20th September 2026, researchers reported a new class of ultra-bright dye-sensitised upconversion nanoparticles capable of detecting chemicals at extremely low concentrations and even distinguishing between molecules that are almost identical in structure.

How Does the Technology Work?

• The nanoparticles are activated using near-infrared light, which can be produced by relatively low-cost lasers.
• Unlike conventional fluorescent materials, they perform upconversion—absorbing several low-energy photons and releasing the energy as a higher-energy photon, producing bright green luminescence.
• Because the excitation light and emitted light are very different in frequency, the desired signal can be separated more easily from background fluorescence, improving detection sensitivity.